Modesto Air Quality in June
Across 2019–2025, Modesto's June air quality had a median AQI of 53 (Moderate) over 210 monitored days in the Modesto, CA area. 6.7% of June days (14 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 85.7% of days. The cleanest June on record here was 2020 (median AQI 47, 0 days above 100) and the worst was 2021 (median 54, 5 days above 100, peak AQI 172).
- Good: 44.3%
- Moderate: 49.0%
- Unhealthy for Sensitive Groups: 6.2%
- Unhealthy or worse: 0.5%
Extra Protection for Modesto Homes
Air quality in Modesto is moderate (AQI 63), with particle pollution the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in Modesto in June?
Moderate on a typical day: median AQI 53 across 2019–2025, with 6.7% of June days above AQI 100. Ground-level ozone is the main driver.
- ✓44.3% of June days were Good (AQI 0–50), 49.0% Moderate (51–100).
- ✓14 days of 210 reached AQI 101+; the June peak was 172.
- ✓Best June: 2020; worst June: 2021.
Frequently asked questions
What is the air quality like in Modesto in June?▾
Across 2019–2025, the median daily AQI in Modesto in June was 53 (Moderate). 44.3% of days were Good, 49.0% Moderate, and 6.7% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is June a good time for outdoor exercise in Modesto?▾
A typical June day in Modesto is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 15 of June days (6.7%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Modesto's June air quality problems?▾
Ground-level ozone set the daily AQI on 85.7% of June days in Modesto. The highest June AQI recorded in 2019–2025 was 172 (Unhealthy), in 2021.
Modesto June air quality, year by year
Modesto June air quality by year (Modesto, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 51 | 2 | 129 | O3 |
| 2020cleanest | 30 | 47 | 0 | 93 | O3 |
| 2021worst | 30 | 54 | 5 | 172 | O3 |
| 2022 | 30 | 53 | 2 | 108 | O3 |
| 2023 | 30 | 49 | 1 | 126 | O3 |
| 2024 | 30 | 66 | 4 | 143 | O3 |
| 2025 | 30 | 56 | 0 | 93 | O3 |
What June air means in Modesto
A typical June day in Modesto is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 15 of June days (6.7%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
June's median AQI of 53 is in line with Modesto's whole-year median of 54, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median June AQI across every EPA metro area (100,635 metro-days, 2019–2025) is 46, so Modesto runs above the national June norm; 6.7% of its June days topped AQI 100 versus 3.7% nationally (above average).
June is part of Modesto's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Modesto
The latest EPA AirNow observation puts Modesto's AQI at 63 (PM10). The figures above are multi-year month statistics, not today's reading.
View current Modesto air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Modesto, CA), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.